Why +2 oxidation state of manganese is more stable?
Atomic number = 25
No. of electrons = 23
Electronic configuration of Mn2+ = [Ar]3d54s0
(1) It is seen from the electronic configuration of Mn2+ that d-orbital is half filled.
(2) A half filled d-orbital is more stable as compared to empty or partially filled orbital.
(3) Hence Mn2+ ion is more stable oxidation state of manganese.